The obligate intracellular parasite Chlamydia infection induces a CTLs response at the site of infection (Kim et al., 2000), and when Fas-associated proteins with a death domain directly activate caspase-8, Chlamydia trachomatis fails to inhibit apoptosis (Waguia Kontchou et al., 2016).The expression of Fas on the surface of CTLs increases with time after Listeria infection. This evidence concerns the gene FAS and listeriosis.